US1975447A - Chewing gum material and method of making same - Google Patents

Description

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Patented Dot. 2, 1934 1,915,441 omwnro GUM MATERIAL AND mzrnon or MAKING s AME Franklin Canning, New York, N; E, assignor to Sweets Laboratories, Inc., New York, N5 Y.,. a corporation of New York No Drawing.

lfhe present invention relates to making a chewing material such we chewing gum base, which can readily be converted into chewing gum by the addition ofany suitable flavoring material, sugary material, filler, medicating agent, and the like, with or without other materials if desired.

Numerous patents have been issued in which rubber in one form or another is used in the preparation of .achewing gum base. Patents have also been issued in which hydrogenated oil is employed, for example patents to Dunham, Numbers 1,534,929, 1,534,930 and 1,534,931. Patents have also been issued in which coumarone resin constitutes a component of the chewing gum, and no claim is made herein to novelty as to'the use of any oi the said ingredients. 1 in accordance with the present invention I do not start with raw rubber or vulcanized rubber, but with rubber latex or some other dispersion of rubber particles in an aqueous vehicle. As the preferred material for this purpose I employ raw rubberlatex, which as well known is a liquid material containing usually about or of rubber hydrocarbon in the form of small particles. As is well known, rubber latex is an emulsion which is not entirely stable, but it can be rendered more or less stable by the addition thereto of a small percentage of ammonia, formaldehyde or equivalent material. Other stabilizing agents can be added which are not volatile with water, .but in the present process i prefer to use latex to which ammonia or similar volatile material has been added as a stabilizing agent.

In carrying out the process ll employ resinous material and particularly I preferably employ coumarone resin or a mixture of coumarone resins or a mixture of coumarone resin with other resin ous materials, as the hardening agent. l preferably employ these in a finely powdered condition, for reasons as will appear below.

I also employ a hydrogenated oil, which may be hydrogenated peanut oil, hydrogenated soybean oil, hydrogenated cotton-seed, sesame, rape or other sweet vegetable oil, although other oils, suitably purified, may be employed. The'hydrogenated oil is preferably of high melting point say hydrogenated oil melting at about to 67 this being ground to a fine powder.

The latex employed is first brought to between 20 and 25% rubber content by the addition oi water, for example to 100 parts of the latex, 50 parts of water may be added. To the above quantity 25 to 90 parts or the pulverized resin and 35 to '75 parts; of the pulverized hard hydrogenated Application Yanuary so, 1930, Sfl'ifl No. 424,111

v 9 Claims. (CI. 99-11) oil are added, preferably at about room tempera- 'ture, and the mixture is worked up on a suitable -m'asticating properties of the chewing gum base. Q5

and soft coumarone resin together, these kneading machine, preferably at room temperature, into a relatively stiff paste. Another quantity of 20 to 85 parts of the pulverized resin and 35 to parts of the pulverized hard hydrogenated oil are then added and the mixture is worked up on a suitable heated kneading machine, such as a Werner 8t Pfleiderer mixer, into a uniform pasty mass, which can then be transferred to a suitable "65 kettle in which it is slowly heated up to about to 6., while being well agitated, either continuously or intermittently, and held at above the boiling point of water for a suflicient time to drive oil the water content of the. latex and the 30 added" water. Care should-be taken not to heat above 125 C., and preferably I employ somewhat lower temperatures than this. During the evaporation of the water {from the mass, the ammonia or formaldehyde or similar volatile preservative @785 in the latex likewise will evaporate.

There are several grades of coumarone resin and I have found that very satisfactory results may be secured by using hard coumarone resin 7 being be suitably blended and if necessary purified, then being cooled and pulverized. To the resin may be added a small amount, say about 3% of powdered cocoa bean to improve the working properties of the mass, and to improve the chewing qualities of the final gum, in addition to the flavor conferred thereby. The 3% above referred to is based on the weight of the final chewing gum base, and this may amount to about 8 or 10% of the weight of the resin.

During and after the expulsion of the water of the latex, the mass is agitated and preferably u kneaded for a considerable time to improve the The proportions of the materials can vary between rather wide limits, the resin being a hardeningagent and the hydrogenated oil beinga softening agent, and the rubber of the latex furnishing a certain degree of spring'iness to the 109 product. v

The chewing gum base when prepared as above indicated can be kept for a longtime if desired before being made up into chewing gum, and the finished gum also can be kept or'stored for long -m5 intervals. It is sometimes advisable to add other fillers which are insoluble in the above mentioned constituents, but these. being in a ilnely divided iorm, such as an lmpalpable powder, will blend readily into themass. lib

itself is a more or less complex material one would In some cases it is advisable to perform the entire evaporation of the water in the kneading machine, which is ventilated for the purpose of allowing 'a current of atmospheric air to pass therethrough. The kneading may be, continued fact that the latex is 'a liquid and can readily be.

passed through a fine strainer to remove all particles of bark, dirt and the like, and latex is usually much purer than ordinary crepe rubber "or other crude forms of rubber, and the separation of impurities from rubber is far more difficult than the. separation of the same impurities from latex. I am aware that heretofore it'has been proposed to employ other kinds of latex in the manufacture of chewing gum, but since latex expect that the use of rubber latex in such mixthe invention and without restricting the invention thereto, the following example of the manufacture of a chewing gum base in accordance with the present invention is given:-

Using a steam jacketed Werner 8r Pfieiderer mixing kettle, mixing the following ingredients as described below without applying heat and at room temperature.

To parts rubber latex of 35% rubber content, add 50 parts of water and start the agitators. Then add slowly 7 parts of cocoa powder and 85 parts of coumarone resin (pulverized) and follow with parts of powdered hydrogenated vegetable-oil.

In the process the rubber latex changes from a liquid to a paste and as more solids are added finally becomes granular in form. The absorbed moisture is then driven off by turning on the steam and slowly raising the temperature in the kettle to about C. Keep the agitators going throughout the process. The heat softens the resin and the hydrogenated oil and the action of the agitators forms the mass into a plastic, homogeneous mixture. After this point-has been reached continue temperature and agitation for about two hours and remove product from the kettle. t

the boiling point of water, while working the I claim: I 1. A process of making chewing gum material which comprises adding pulverized resinous material including coumarone resin and pulverized hard hydrogenated oil, to uncoagulated latex, in such proportions as to form a paste, and well mixing said materials, thereafter adding more resinous material and hard oil'and working the mixture while heating to well above the boiling point of water, and holding at above the boiling point of water, while working the mass, until a substantially dry mixture has been formed.

2. Inthe process of claim 1, the step of diluting the latex, before the first addition mentioned, with about one-fourth to three-fourths of its bulk of water.

3. A process as in claim 1, in which for 100 parts of rubber latex, about 45 to 1'75 parts of resin and about 70 to 150 parts of hard hydrogenated oil are added, in the two steps mentioned.

4. A process as in claim 1, in which, for 100 parts of rubber latex, about 100 to parts of the resin and about 120 to 140 parts of the hard hydrogenated oil are added.

5. A process of making chewing gum material which comprises adding pulverized resinous material including coumarone resin and pulverized hard hydrogenated oil, to an intimate dispersion of particles of rubber hydrocarbon in an aqueous liquid vehicle, in such proportions as to form a paste, and well mixing said materials, thereafter adding more resinous material and hard oil and working the mixture while heating to well above the boiling point of water, and holding at above lit mass, until a substantially dry mixture has been formed.

6. A process of making chewing gum material which comprises adding pulverized resinous material including coumarone resin and pulverized 1 5 hard hydrogenated oil, to uncoagulated rubber latex, in such proportions as to form apaste, and well mixing said materials, thereafter adding more resinous material and hard oil and working the mixture while heating to well above the boil ing point of water, and holding at above the boiling point of water, while working the mass, to drive off water from the mass.

.7. A substantially dry homogeneous mixtureof the composite solids of rubber latex, coumarone 12, resin and hydrogenated oil in such proportions as to form a chewing gum base, substantially freed of the water content of the latex.

8. A dried mixture containing the composite solids of 100 parts of rubber latex, about 45 to 175 parts of resin including coumarone resin and about '70 .to 150 parts of hard hydrogenated oil, such mixture being adapted for use in chewing 9. In the manufacture of chewing gum base containing rubber hydrocarbon, the step of adding all of the rubber in the form of rubber latex. FRANKLIN V. CANNING.